From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266365AbUG0Ilr (ORCPT ); Tue, 27 Jul 2004 04:41:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266363AbUG0Ilr (ORCPT ); Tue, 27 Jul 2004 04:41:47 -0400 Received: from fed1rmmtao12.cox.net ([68.230.241.27]:9408 "EHLO fed1rmmtao12.cox.net") by vger.kernel.org with ESMTP id S266366AbUG0Iku (ORCPT ); Tue, 27 Jul 2004 04:40:50 -0400 To: Matt Mackall cc: linux-kernel@vger.kernel.org Subject: Re: [PATCH] Delete cryptoloop References: <20040726200126.GQ5414@waste.org> From: Junio C Hamano Date: Tue, 27 Jul 2004 01:40:47 -0700 In-Reply-To: (Matt Mackall's message of "Mon, 26 Jul 2004 20:40:16 GMT") Message-ID: <7v4qntc06o.fsf@assigned-by-dhcp.cox.net> User-Agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org >>>>> "MM" == Matt Mackall writes: MM> Here's a scenario: corrupt government agency secretly watermarks MM> incriminating documents. Brave whistleblower puts them on his laptop's MM> cryptoloop fs, but gets taken aside by customs agents on his way out MM> of the country. Agents check his disk for evidence of the watermark MM> and find enough evidence... Jari's exploit uses the property that his watermarks are encrypted to identical ciphertext blocks, but does it mean that the technique can be used to prove that identical ciphertext are from the watermarks and not coming from mere coincidence?